18316801666537 has 32 divisors (see below), whose sum is σ = 21253297912704. Its totient is φ = 15601108377600.

The previous prime is 18316801666523. The next prime is 18316801666543. The reversal of 18316801666537 is 73566610861381.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18316801666537 - 2²³ = 18316793277929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18316801616537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188918962 + ... + 189015892.

It is an arithmetic number, because the mean of its divisors is an integer number (664165559772).

Almost surely, 2^{18316801666537} is an apocalyptic number.

18316801666537 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18316801666537 is a deficient number, since it is larger than the sum of its proper divisors (2936496246167).

18316801666537 is a wasteful number, since it uses less digits than its factorization.

18316801666537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101529.

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 18316801666537 in words is "eighteen trillion, three hundred sixteen billion, eight hundred one million, six hundred sixty-six thousand, five hundred thirty-seven".